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History of CT


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In 1917 who correctly theorized that a sufficient number of mathematic projections, properly manipulated, would produce an image of the represented object?
Johann Radon
What was the significance of Radon's mathematic image of a gravity well?
It represents the first example of producing a polar, back projected image by computation.
W.H. Olendorf constructed the first prototype reconstruction tomography scanner in what year?
In 1963 who proposed reconstruction and tomographic approaches to nuclear medicine.... concepts today that are represented by the spect camera.
David E. Kuhl and Roy Q. Edwards
Allen Cormack published a series of mathematic equations which he had developed, refining the Radon Transform method for work in radiotherapy treatment in what year?
1963 and 1964
Who shared the nobel prize in medicine and physiology for their work on the CT scanner and reconstruction methods?
Allan Cormack and Houndsfield
Why was Allen Cormacks findings so significant in CT?
These equations were the heart of CT computer algorithms, as later developed.
Houndsfields first prototype device took how long to scan and process and collected how much data?
9 days, 2.5 hours, 28,000 data points.
How was the time great reduced?
An x-ray machine replaced the gamma source, the imaging time was reduced to one day
When did the first CT clinical prototype start working?
Describe the first clinical prototype of CT?
It used an x-ray source and single sodium Iodide photomultiplier scintillation detector rotating through 180 degree, obtainin a view or projection every 1 degree of arc, producing a total of 43,200 meausrements.
How was the EMI mark I improved later?
scanning time went from 20 minutes to 4.5 minutes, and the matrix went from 80 X 80 to 160 X 160
In 1972 what was demonstrated in the first living patient to be scanned?
Brain Tumor
Who developed the first whole body CT scanner? What was the name of it? And when was the first one installed?
R.S. Ledley, ACTA scanner, 1973
Who developed the second generation scanner?
Ohio Nuclear
Who developed the first 3rd generation scanner? In what year?
General Electric, 1974
Who developed the design for the first fourth generation scanner? In what year?
American Science and Engineering, 1975
In what year did Cormack and Hounsfield shared the Nobel Prize for Medicine for their contributions to CT?
In what year was houndsfield knighted for his contributions to medicine?
Who demonstrated that CT actually delivers a greater dosage than conventional radiography? In what year?
Euclid Seeram, 1982
What part of x-ray tube technology has advanced rapidly because of CT?
Anode Heat Storage Capacity
When did slip rings for CT scanners occur?
mid 1980's
When was the 5th generation CT scanner developed?Who developed and designed it? What is it called and primarily used for?
1983, Douglas Boyd, Electron Beam CT scanner, Used primarily for coronary and cardiac studies.
Who modified a siemens third generation scanner to perform helical, and in what year?
Dr. Willi Kalender, 1988
3rd generation scanners with a slip ring are really what generation?
6th generation
Who developed the CT Twin and in what time range?
Elsinct, late eighties and early nineties.
Who bought the CT twin and in what year? Who bought that company?
Marconi also known as picker, MX800, Phillips then bought them and continued to produce the MX 8000

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